The game didn't come to life until the 78th minute when Jason Puncheon opened the scoring for Palace with a good left footed finish. United responded well though and hit back three minutes later when Juan Mata put the ball in the net after a cross from Wayne Rooney.
The game then went into extra time and it looked like Palace were going to get the upper hand when Chris Smalling was sent off in the first period for a second yellow card.
Palace couldn't capitalise though and United won the game when Jesse Lingard smashed a lovely volley into the net 10 minutes from time to earn United the victory.
The win saw United end the season on a high and much to ponder ahead of next season. So after the win what can the Reds learn from the game?
Rooney can have a big effect on the game from midfield
Rooney once again started the game in midfield for United. The Englishamn hasn't played in the striker role for a while and has now found himself a new role in the team. The striker played a massive role during the game to get the team back into the match when Puncheon had given Palace the lead by driving forward and playing a big part in the equaliser. Rooney is thriving by having more responsibility in the team and even though he makes some mistakes he also makes some incredible passes and shows why he is so important to the team. Rooney showed the desire needed to win the FA Cup as it was the one piece of silverware he had never won before.
The future is bright
It was another game when the younger United players stood up and showed that they can take the team forward. Marcus Rashford, starting in his first FA Cup final, showed his undoubted class by causing the Palace defenders all kind of trouble during the game. It's a pity that the youngster had to go off injured before the end of the game but he once again showed why a lot of people are talking about him. Lingard another United born star stood up when the team needed him most by scoring an absolute screamer to win the Cup for United. Lingard takes a lot of stick from the United fans but he never lets the team down and deserves to be at least a squad player next season.
Mata shows his class when it was needed most
Mata stood up at Wembley and showed his calmness to get United back into the game with the equalising goal at such a crucial stage of the game. Mata has been heavily criticised by a lot of United fans as they feel he doesn't do enough to warrant playing in the side but he showed during the final why he has to play. The Spaniard did some really nice things during the match and could have scored in the first half of the game if Wayne Hennessy didn't make such a good save. Mata has scored some important goals in his short United career and continues to show that he is a big game player and he deserves once again to stay at the club as one of the more experienced players in the squad.
United players need to keep their heads better during games
United suffered with the physical battle against Palace and had to endure a lot of yellow cards during the game. Smalling was also sent off in a move that could have cost United the game. The players need to learn to be more physical without stepping over the mark and they will get better. The team are missing some real grit which teams take advantage of and Palace were trying their hardest to disrupt the whole team so they couldn't play as they would have liked to.